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group email notification not referencing to language file
Can you check your lang file language/en-GB/en-GB.com_community.ini, and search these strings :
COM_COMMUNITY_GROUPS_EMAIL_NEW_MEMBER_JOINED_SUBJECT="\n%1$s joined your group, %2$s ."
COM_COMMUNITY_GREETING="Hi {target},"
COM_COMMUNITY_GROUPS_EMAIL_NEW_MEMBER_JOINED_SUBJECT="\n%1$s joined your group, %2$s ."
if you cant find them, just add them then.. and change the string value if you want.